<style>
#box {
  cursor: move;
  position: absolute;
  border: 1px solid #CCCCCC;
  -webkit-box-shadow: 10px 10px 25px #ccc;
  -moz-box-shadow: 10px 10px 25px #ccc;
  box-shadow: 10px 10px 25px #ccc;
  background-color: #194678;
}

#chart {
  height: 100%;
}


.chart {
  width: 180px;
  height: 160px;
}
</style>
<div class="chart box" id="box">
  <div id="chart"></div>
</div>
<button class="btn" id="render">button</button>